Session and back button problem

[Anon]

Hi,

I'm using sessions in PHP4 with MySQL for user authentification (PHPbuilder.com script). When i loggout i kill the session and delete the entry in MySQL, but when i hit the back button until the page next to the submit form, it has the refresh warning page and if i hit refresh, the session comes back. Is there a way to avoid that? I'm using the nocache header too.
I've been trying to figure that out for ages and can't think of anything.

[Anon]

Not sure if your situation is the same, but I solved a similar problem by moving the login/session_start to a new window. I used javascript to open a new window asking for username and password, then on correct authentication it closes the login window and reloads the main browser window. That way after logout, using the back button never gets the submit page and therefore cant repost the data to restart the session.